linux-kernel - Re: [PATCH] thermal: Hunt zero trip points thermal zones usage

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Date:   Mon, 6 Feb 2023 19:00:13 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     rjw@...ysocki.net, linux-acpi@...r.kernel.org,
        linux-pm@...r.kernel.org, Sebastian Reichel <sre@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Kees Cook <keescook@...omium.org>,
        "Lee, Chun-Yi" <joeyli.kernel@...il.com>,
        Chuansheng Liu <chuansheng.liu@...el.com>,
        ye xingchen <ye.xingchen@....com.cn>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thermal: Hunt zero trip points thermal zones usage

On 06/02/2023 17:08, Rafael J. Wysocki wrote:
> On Fri, Feb 3, 2023 at 6:59 PM Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>>
>> Some drivers are declaring a thermal zone without any thermal trip
>> points.
>>
>> On the other side, we are introducing the function
>> thermal_zone_device_register_with_trips() which provides an array of
>> generic thermal trip points. When all the drivers will be converted to
>> the generic trip points, keeping two functions will be useless.
>>
>> Most of the drivers are now using
>> thermal_zone_device_register_with_trips() with the generic trip
>> points. As soon as the remaining drivers are merged, the
>> thermal_zone_device_register_with_trips() will be renamed to
>> thermal_zone_device_register().
> 
> So why is this the first time I'm learning about this plan?

Well it is not a plan, it looked purely logical to me that the 
_with_trips variant was added to support the generic trip points in 
addition to the specific trips. As soon as all the drivers are 
converted, there is no need to have these two functions anymore and we 
can fall back to the previous name (or a shorter one).

>> Obviously this renaming can only happen if there are no more user of
>> the thermal_zone_device_register() function.
>>
>> This change uses thermal_zone_device_register_with_trips() with a NULL
>> parameter for the trip point array instead of
>> thermal_zone_device_register().
> 
> And later it will be renamed to thermal_zone_device_register() again?

Yes, that was the idea, unify the name and then use a cocci script to 
rename them all.

> Can we just stop confusing people this way?
> 
> What would be wrong with changing both
> thermal_zone_device_register_with_trips() and
> thermal_zone_device_register() together when we are ready?  And why
> can't the both be replaced with something line thermal_zone_register()
> doing all of the necessary things in one go?  Why do we have to make
> confusing and redundant changes?

For me the result will be the same, if you prefer to wait for all the 
drivers to be converted then it is fine for me.


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